About 15-years ago I read an article published in Motorhome Magazine about a fuel that the Nevada Highway Patrol and some buss company in California was testing. It was called A-55 there is another name or it as well I believe it is called A-21. Anyway the fuel was a light oil (ie. naphtha) mixed into 55% water using a secret emulsifier to keep them mixed. There was also an interview in Seattle Times (I believe or the P.I.) of a race car driver that was using this fuel in his race car. A-55 was first invented by a German engineer working for Caterpillar Diesel in Nevada. There was only a slight modification made to either gas or diesel motors to make it work--I don't know what they did to the diesel cars, but they added nickle spark-plugs to the gas engines.